Google Authenticator

Abstract

1. Introduction

Simple, easy to use server-side two-factor authentication library for .NET that works with Google Authenticator

2. Objective

Simple, easy to use server-side two-factor authentication library for .NET that works with Google Authenticator and Authy.

This project demonstrates how C# can be applied to a real-world Cybersecurity & Ethical Hacking problem.

4. Technology Stack

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

• .NET SDK / Visual Studio
• Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/BrandonPotter/GoogleAuthenticator.git
cd GoogleAuthenticator

using Google.Authenticator;

string key;

TwoFactorAuthenticator tfa = new TwoFactorAuthenticator();
SetupCode setupInfo = tfa.GenerateSetupCode("Test Two Factor", "user@example.com", key, false, 3);

string qrCodeImageUrl = setupInfo.QrCodeSetupImageUrl;
string manualEntrySetupCode = setupInfo.ManualEntryKey;

imgQrCode.ImageUrl = qrCodeImageUrl;
lblManualSetupCode.Text = manualEntrySetupCode;

// verify
TwoFactorAuthenticator tfa = new TwoFactorAuthenticator();
bool result = tfa.ValidateTwoFactorPIN(key, txtCode.Text)

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

• Add logging and alert notifications (email / Telegram)
• Write a threat model document for the tool
• Package it with Docker for safe lab testing

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

1. Which threat or attack does this project defend against?
2. What detection or protection technique is used and what are its limits?
3. How are false positives and false negatives handled?
4. Which cryptographic algorithms or security standards are involved?
5. What legal and ethical rules apply when testing a tool like this?

9. Source Code & License

This project is developed by BrandonPotter and published on GitHub under the Apache License 2.0. Please follow the license terms and credit the original author when you use or modify this code.